\begin{tikzpicture}
    \tkzDefPoints{0/0/O, -1.5/0/A, 1.5/0/B}
    \tkzDefPoint(200:1.5){C}
    \tkzDefPoint(290:1.5){D}

    \tkzDrawCircle[thick](O,A)
    \tkzDrawSegments(A,B  C,D)
    \tkzDrawPoint(O)
    \tkzLabelPoints[left](A,C)
    \tkzLabelPoints[right](B)
    \tkzLabelPoints[below right](D)
    \tkzLabelPoints[below](O)
\end{tikzpicture}

